If the length of the diagonal of a square is 20cm,then its perimeter must be
a. 402cm b. 302cm c. 10cm d. 152cm
We know that d=√2s
Given diagonal = 20 cm
=> s = 20/2 cm
Therefore, perimeter of the square is 4s = 4 x 20/2 = 402 cm.
The length of a mirror arc is 2/9 of the circumference of the circle. Write the measure of the angle (in degrees) subtended by the arc at the centre of the circle.
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