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eh gee athe surface area ofa squar, pyramid with base edg, , metres and lateral edge, , , , rea is 4 square metres, ‘To; ompute the area, ateral faces, we need the slant height. Inthe righttriangl, , , , toned above, one side is half the base edge that is,, retre and the hypotenuse is the lateral edge of 3 metres, So, the slant height is, Wor metres, , , , sing this, the area of each triangular face ig, , , , , , =4+842 square metres,, , , , fied with this, a calculator can be t, , , , cd, (or an approximate value of, 2 recalled) to compute this as 15.3] square metres., , (1) Asquare of side 5 centimetres, and four isosceles triangles of base, ’ 5 centimetres and height 8 centimetres, are to be put together to make, a square pyramid. How many square centimetres of paper is needed?, , (2) _- A toy isin the shape of a square pyramid of base edge 16 centimetres, and slant height 10 centimetres. What is the total cost of painting 500, 0 S per square metre?, such toys, at 80 rupees per sqi, , , , , , 2021/10/23 1