find the length of diagonal of a square of side 20cm. find its perimeter.
Answers
Answered by
0
Answer:
80cm
Step-by-step explanation:
Diagonal of a square = √( side² + side² )
= √ ( 20² + 20² )
=√ (400+400)
= √800
= 40√2 cm
Perimeter of square = 4 × side = 4 × 20 = 80cm
Answered by
0
Answer:
Length of a side of the square = a = 20cm
d = a √2
= 20√2 cm
or
Let AC be diagonal
AB² + BC² = AC²
(20)² + (20)² = AC²
400 + 400 = AC²
800 = AC²
√800 = AC
√2×400 = AC
20√2 = AC
d = 20√2 cm
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