Area
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171
PQRS is a square of sides 2 cm & ST = 2 cm. Also, PT=RT. What is the area of ∆PST?
172 PQRST is a pentagon in which all the interior angles are unequal. A circle of radius ‘r’ is inscribed in each of the vertices. Find the area of portion of circles falling inside the pentagon:
173 There is an equilateral triangle with a square inscribed inside it. One of the sides of the square lies on a side of the equilateral △. What is the ratio of the area of the square to that of the equilateral triangle?
174 Consider a right–angled triangle with inradius 2 cm and circumradius of 7 cm. What is the area of the triangle?
175
Three circles with radius 2 cm touch each other as shown :
Find the area of the circle, circumscribing the above figure:
176 A room has floor size of 15×6sq.cm. What is the height of the room , if the sum of the areas of the base and roof is equal to the sum of the areas of the four walls ?
177
A circle is inscribed in an equilateral triangle of side 24 cm, touching it's sides. What is the area of
the remaining portion of the triangle?
178 There are 5 concentric circles that are spaced equally from each other by 1.25 cms. The innermost circle has a square of side √(32) cm inscribed in it. If a square needs to be inscribed in the outermost circle, what will be it's area?