{"id":2241,"date":"2023-10-02T11:28:02","date_gmt":"2023-10-02T11:28:02","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=2241"},"modified":"2023-10-02T11:34:55","modified_gmt":"2023-10-02T11:34:55","slug":"week-1-ss1-second-term-technical-drawing-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-1-ss1-second-term-technical-drawing-notes\/","title":{"rendered":"Week 1 – SS1 Second Term Technical Drawing Notes"},"content":{"rendered":"

SECOND TERM E-LEARNING NOTE
\n<\/strong>SUBJECT:TECHNICAL DRAWING
\n\t\t\t\t<\/strong>CLASS:SS1
\n\t\t\t\t<\/strong>TITLE:SECOND TERM SCHEME OF WORK
\n<\/strong>
\n\u00a0<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n
WEEK 1: <\/strong>Revision of the work for last term. Inscribed and circumscribed.<\/td>\n<\/tr>\n
WEEK 2 <\/strong>Escribed circle.<\/td>\n<\/tr>\n
WEEK 3:<\/strong>Polygons<\/td>\n<\/tr>\n
WEEK 4: <\/strong>Plain scales<\/td>\n<\/tr>\n
WEEK 5: <\/strong>Diagonal and chordalScales<\/td>\n<\/tr>\n
WEEK 6: <\/strong> Enlargement and reduction of plain figures<\/td>\n<\/tr>\n
WEEK 7: <\/strong>Enlargement and reduction of plain figures<\/td>\n<\/tr>\n
WEEK 8: <\/strong>Equal area of figures <\/td>\n<\/tr>\n
WEEK 9: <\/strong>Equal area of figures<\/td>\n<\/tr>\n
WEEK 10: <\/strong>Tangency<\/td>\n<\/tr>\n
WEEK 11<\/strong>.Revision and Examination.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u00a0Reference materials:
\n<\/em><\/strong>Technical drawing by J.N. Green.
\nEngineering drawing 1 by M.A.Parker and F.Pickup
\nMetal work technology by G.H. Thomas.
\nDrafting Technology and practice by William P. Spence
\nTechnical Drawing by F.B Mayock( 1- 4 )
\nBasic technology for junior secondary schools book 1 by G.N Nneji, E.J. Okon, V.C. Nwachukwu, N.A. David, and T.C. Ogbuanya.Pages 1-17, 34-78.
\nBasic technology for junior secondary schools book 2 by I. Elekwa , O.A. Bamiro, A.O. Oluyide,
\nD.L Ladoye, A. Nurudeen and I.O. Akuru
\nTechnical drawing for senior secondary schools by Y.A Thanni and C.A Faseun-Motesho Pages 97-103<\/p>\n

\u00a0
\n\u00a0WEEK ONE DATE:\u2026\u2026\u2026\u2026\u2026\u2026
\n<\/strong>Revision of last term work. Inscribed and circumscribed circles
\n<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
\nContent:
\n<\/strong>(i) Inscribed circles.
\n(ii) Circumscribed circles <\/p>\n

\u00a0Inscribed circles
\n\t\t\t<\/strong>\"\"\/Example 1 To inscribe a circle in a given triangle.<\/em><\/strong><\/p>\n

\u00a0
\n\u00a0
\n\u00a0Method:
\n<\/strong>Draw the given triangle ABC.
\nBisect any two angles whose bisectors intersect at point O.
\nDraw a line from point O perpendicular to any side of the triangle ie OD.
\nWith the compass pin at point O and radius OD, draw the required circle.<\/p>\n

\u00a0\"\"\/Example 1 To inscribe three equal circles in an equilateral triangle, each circle to touch two sides and<\/em>
\n\t\t\t<\/strong>two other circles
\n<\/em><\/strong>
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0Method:
\n<\/strong>(i) Draw the given equilateral triangle.
\n(ii) Bisect any two of the angles e.g X and Y to obtain the centre of the triangle, O.
\n(iii) Draw a line from Z through O to B.
\n(iv) Bisect angle OBC to obtain the centre of one of the circles, A.
\n(v) With O as centre and radius OA, locate the centres 1 and 2 of the remaining two circles.
\n(vi) Drop a perpendicular from A which meets line XB at point C. AC is the radius of the three circles.
\n(vii) With compass pin at points A, 1 and 2 in turn, draw the three circles.<\/p>\n

\u00a0\"\"\/Example 3To inscribe a circle in any sector.<\/em><\/strong><\/p>\n

\u00a0
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0Method:
\n<\/strong>(i) Bisect the vertical angle R. This angular bisector meets the arc of the sector at point S.
\n(ii) Construct a tangent at point S.
\n(iii)Extend the radius of the sector to meet the tangent at points P and Q.
\n(iv)Bisect one of the base angles e.g< RQS to obtain the centre of the circle, O.
\n(v) With O as centre and radius OS, draw the required circle.
\nExample 4To inscribe a circle in any regular polygon, rhombus or deltoid(kite).<\/em><\/strong>
\n\t\t\"\"\/<\/p>\n

\u00a0
\n\u00a0
\n\u00a0
\n\u00a0Method:
\n(i) Bisect any two angles of the given polygon. The two bisectors meet at a point O.
\n(ii) Point O is the centre of the circle. Drop a perpendicular from O to any side of the polygon, ie OD.
\n(iii)With O as centre and radius OD, draw the required circle.<\/p>\n

\u00a0Evaluation Questions
\n<\/strong>1. A triangle ABC stands on side AB as base and has the following dimensions: AB = 60mm, AC = 50mm
\nand angle CAB = 670<\/sup>. Construct the triangle and draw a circle in it.
\n2. Construct a regular polygon whose side is of length 40mm. Draw a circle in it to touch all the sides. <\/p>\n

\u00a0
\n\u00a0Circumcribedcircles<\/strong><\/p>\n

\u00a0\"\"\/Example 1 To circumscribe a circle on a triangle or inscribe a triangle in a circle
\n<\/em><\/strong>
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0Method:
\n<\/strong>(i) Draw the given triangle ABC.
\n(ii) Bisect any two sides of the triangle ie AC and BC, These bisectors intersect at point O.
\n(iii) With O as centre and radius OA or OB or OC, draw a circle to pass through the three points.<\/p>\n

\u00a0Evaluation Questions
\n<\/strong>
\n\u00a01. Construct a triangle ABC on AB as base with AB = 70mm, AC = 57mm and BC = 76mm. Circumscribe a
\ncircle on it.
\n2. Construct a triangle ABC with side AB = 70mm, AC = 90mm and < ABC = 1050<\/sup>. Circumscribe a circle
\non it.<\/p>\n

\u00a0General evaluation\/revisionalquestions
\n<\/strong>
\n\u00a01. A triangle has a perimeter 130mm, base 40mm and a base angle 1050<\/sup>. (i) Construct the triangle.
\n (ii) Measure and state the other base angle. (WAEC)
\n2. Construct a triangle PQR with base = 70mm, vertical height = 50mm and vertical angle = 550
\n<\/sup> (WAEC)
\n3. Construct a triangle whose perimeter is 120mm and of sides in the ratio 3:4:5. (WAEC).
\n4. Construct a triangle of sides AB = 60mm, AC = 55mm and < ABC = 600<\/sup>. Construct a triangle similar
\nto this and whose perimeter is 140mm.
\n5. Inscribe an octagon in a square of side 80mm.<\/p>\n

\u00a0Reading assignment
\n<\/strong>Technical drawing by JN Green.Pages 20-22.<\/p>\n

\u00a0\"\"\/Weekend Assignment<\/strong>
\n\t\tObjective<\/strong><\/p>\n

\u00a0
\n\u00a0
\n\u00a01. Which of the following best describe the figure shown above? A. Inscribed. B. Circumscribed.
\n\"\"\/ C. Escribed. D. Rebated.<\/p>\n

\u00a0
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a0
\n\u00a02. The circle P in the figure above can best be described as A. inscribed. B. circumscribed. C. escribed.
\nD. concentric.
\n3. Which of the following is correct in inscribing a circle in a triangle? A. Bisect one of the angles.
\n B. Bisect two sides of the triangle. C. Bisect two angles. D. Bisect three sides.
\n4. In order to circumscribe a circle on a triangle, which of the following is a correct step? A. Bisect two
\nsides of the triangle. B. Bisect two angles of the triangle. C. Bisect one side and angle. D. Bisect two
\nangles and one side.
\n\"\"\/5. Which of the following represents the radius of the circle drawn below? A. QR. B. OT. C. OP.
\n D. OQ<\/p>\n

\u00a0
\n\u00a0
\n\u00a0
\n\u00a0Theory
\n<\/strong>1. Construct a triangle PQR with side PQ = 80, and angle PQR = QPR = 600<\/sup>. (show all construction lines).
\n (i) Find the lengths PR and QR. (ii) Inscribe a circle in the triangle PQR. (iii) Name the triangle PQR.
\n2. Construct a triangle ABC with side AB = 50mm, AC = 90mm and < ABC = 1050<\/sup>. Circumscribe a circle
\non the triangle.<\/p>\n","protected":false},"excerpt":{"rendered":"

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