base of an isosceles triangle is 42 cm and its area is 420 , find the height and perimeter.
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Step-by-step explanation:
area of triangle = 1/2 base × height
420= 1/2 ×42 × height
420= 21×height
20 = height
P=2a+b
a is 29 and b is 20
perimeter is 78
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