{"id":981,"date":"2023-09-27T10:55:31","date_gmt":"2023-09-27T10:55:31","guid":{"rendered":"http:\/\/localhost\/ecole9ja\/?p=981"},"modified":"2023-09-27T10:59:01","modified_gmt":"2023-09-27T10:59:01","slug":"week-4-and-5-jss-2-second-term-basic-technology-lesson-notes","status":"publish","type":"post","link":"https:\/\/ecolebooks.com\/nigeria\/posts\/week-4-and-5-jss-2-second-term-basic-technology-lesson-notes\/","title":{"rendered":"Week 4 and 5 – Jss 2 Second Term Basic Technology Lesson Notes"},"content":{"rendered":"

Week 4&5; area of plane figure<\/p>\n

Area of Plane Shapes
\n<\/h2>\n

Area is the size of a surface!Learn more about Area, or try the Area Calculator.<\/em><\/p>\n

\n\n\n\n\n\n\n\n
\"\"<\/td>\nTriangleArea = \u00bd \u00d7 b \u00d7 hb = baseh = vertical height<\/td>\n\u00a0\u00a0<\/td>\n\"\"<\/td>\nSquareArea = a2<\/sup>a = length of side<\/td>\n<\/tr>\n
\"\"<\/td>\nRectangleArea = w \u00d7 hw = widthh = height<\/td>\n\u00a0\u00a0<\/td>\n\"\"<\/td>\nParallelogramArea = b \u00d7 hb = baseh = vertical height<\/td>\n<\/tr>\n
\"\"<\/td>\nTrapezoid (US)Trapezium (UK)Area = \u00bd(a+b) \u00d7 hh = vertical height<\/td>\n\u00a0\u00a0<\/td>\n\"\"<\/td>\nCircle Area = \u03c0 \u00d7 r2<\/sup>
\n\t\t\t\t\t\t\t\tCircumference = 2 \u00d7 \u03c0 \u00d7 rr = radius<\/td>\n<\/tr>\n
\"\"<\/td>\nEllipseArea = \u03c0ab<\/td>\n\u00a0\u00a0<\/td>\n\"\"<\/td>\nSectorArea = \u00bd \u00d7 r2<\/sup> \u00d7 \u03b8 r = radius\u03b8 = angle in radians<\/strong><\/td>\n<\/tr>\n
Note: h is at right angles to b:<\/td>\n\u00a0\u00a0<\/td>\n\"\"\/<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u00a0
\n\u00a0<\/p>\n

Example: What is the area of this rectangle?
\n<\/h3>\n

\"\"\/
\n\t\tThe formula is:
\nArea = w \u00d7 hw = widthh = height
\nWe know w = 5<\/strong> and h = 3<\/strong>, so:
\nArea = 5 \u00d7 3 = 15<\/strong><\/p>\n

Example: What is the area of this circle?
\n<\/h3>\n

\"\"\/
\n\t\tRadius = r = 3 <\/p>\n

\n\n\n\n\n\n\n\n
Area<\/td>\n\u00a0\u00a0<\/td>\n= \u03c0 \u00d7 r2<\/sup><\/td>\n<\/tr>\n
\u00a0\u00a0<\/td>\n\u00a0\u00a0<\/td>\n= \u03c0 \u00d7 32<\/sup><\/td>\n<\/tr>\n
\u00a0\u00a0<\/td>\n\u00a0\u00a0<\/td>\n= \u03c0 \u00d7 (3 \u00d7 3)<\/td>\n<\/tr>\n
\u00a0\u00a0<\/td>\n\u00a0\u00a0<\/td>\n= 3.14159… \u00d7 9<\/td>\n<\/tr>\n
\u00a0\u00a0<\/td>\n\u00a0\u00a0<\/td>\n= 28.27<\/strong> (to 2 decimal places)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Example: What is the area of this triangle?
\n<\/h3>\n

\"\"\/
\n\t\tHeight = h = 12
\nBase = b = 20
\nArea = \u00bd \u00d7 b \u00d7 h = \u00bd \u00d7 20 \u00d7 12 = 120<\/strong>
\n\t\t\u00a0
\n\u00a0A harder example:<\/p>\n

Example: Sam cuts grass at $0.10 per square meter
\n<\/h3>\n

How much does Sam earn cutting this area:
\n<\/h3>\n

\"\"\/
\n\t\tLet’s break the area into two parts:
\n\"\"\/
\n\t\tPart A is a square:
\nArea of A = a2<\/sup> = 20m \u00d7 20m = 400m2<\/sup>
\n\t\tPart B is a triangle. Viewed sideways it has a base of 20m and a height of 14m.
\nArea of B = \u00bdb \u00d7 h = \u00bd \u00d7 20m \u00d7 14m = 140m2<\/sup>
\n\t\tSo the total area is:
\nArea = Area of A + Area of B = 400m2<\/sup> + 140m2<\/sup> = 540m2<\/sup>
\n\t\t\u00a0
\n\u00a0Sam earns $0.10 per square meter
\nSam earns = $0.10 \u00d7 540m2<\/sup> = $54
\nAssignment<\/p>\n

    \n
  • \n
    Construct a rectangle equal to the area of a given triangle\n<\/div>\n<\/li>\n<\/ul>\n

    \u00a0
    \n\t\t\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

    Week 4&5; area of plane figure Area of Plane Shapes Area is the size of…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,102],"tags":[],"class_list":["post-981","post","type-post","status-publish","format-standard","hentry","category-posts","category-second-term-jss-2-basic-technology"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/981","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/comments?post=981"}],"version-history":[{"count":1,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/981\/revisions"}],"predecessor-version":[{"id":982,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/posts\/981\/revisions\/982"}],"wp:attachment":[{"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/media?parent=981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/categories?post=981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecolebooks.com\/nigeria\/wp-json\/wp\/v2\/tags?post=981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}