find the perimeter of a rectangle whose length is 21 cm and a diagonal is 29 cm
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Answered by
4
Answer:
82
Step-by-step explanation:
let the breath be x
Pythagoras theorem : l^2 + b^2 = d^2
= 21^2 + x^2 = 29^2
= 441 + x^2 = 841
= x^2 = 841 - 441
= x = ✓ 400
= x = 20
perimeter = 2(l+b)
= 2(21+20)
= 2*41
= 82
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