Question

square box of dimensions 10*10 has one fourth of its area shaded. What percentage of area of the square is unshaded: *​​

Answer 1

Answer:

Convex lenses concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper. As the heat increases, combustion will occur when the spot becomes too hot and the paper will burn.

Answer 2

Explanation:

Area of unshaded portion = Area of rectangle - Area of circle

= l×b−πr

2

= 14×10−

7

22

×3.5×3.5

= 140−38.5

101.5 m

it's Isha malviya

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