Question

26.write down the formula of area & perimeter of following; (a) right triangle (b) square (c) rectangle
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Answer 1

Right triangle:

$area \: of \: right \: angled \: triangle \: = \frac{1}{2} b \: h$

$perimeter \: = b + h + √( {b}^{2} + {h}^{2})$

where, b is the base and h is altitude of triangle

Square:

$area \: of \: square \: = {a}^{2}$

$perimeter = 4a$

where a is the side of square

Rectangle

$area \: of \: rectangle = l \times b$

$perimeter \: = 2(l + b)$

where l and b is the length and breadth of the rectangular respectively