21.
Twenty-nine times the area of a square is one square metre less than six times the area of the second square and nine times its side exceeds the perimeter of other square by 1 metre. The difference in the sides of these squares is :

22.
In ΔPQR, side PQ = 32 cm and side PR = 25 cm. What is the area of ΔPQR ?
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23.
In an isosceles triangle, the measure of each of the equal sides is 10 cm and the angle between them is 45° . The area of the triangle is :

24.
A triangle and a parallelogram are constructed on the same base such that their areas are equal. If the altitude of the parallelogram is 100 m, then the altitude of the triangle is :

25.
The circumference of a circle, whose area is 24.64 m2 , is :

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