# CBSE Class 10-Mathematics: Chapter – 12 Areas Related to Circles Part 7 (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 15**:

Find the area of the shaded region in figure, if radii of the two concentric circles with center O are and respectively and

**Answer**:

Area of shaded region Area of sector Area of sector

**Question 16**:

Find the area of the shaded region in figure, if ABCD is a square of side and APD and BPC are semicircles.

**Answer**:

Area of shaded region

Area of square (Area of semicircle Area of semicircle BPC)

**Question 17**:

Find the area of the shaded region in figure, where a circular arc of radius has been drawn with vertex O of an equilateral triangle OAB of side as centre.

**Answer**:

Area of shaded region

Area of circle Area of equilateral triangle Area common to the circle and the triangle

**Question 18**:

From each corner of a square of side a quadrant of a circle of radius is cut and also a circle of diameter is cut as shown in figure. Find the area of the remaining portion of the figure.

**Answer**:

Area of remaining portion of the square

Area of square