In the given figure PQR is a right angled triangle with PQ=21cm and PR=42cm. With the vertices P,Q, and R as centres arcs are drawn each of radius 10cm. Find the area of the shaded region. (Image is attached)

Hi,

Find the area of triangle.
Now we also know that area of sector of a circle is related to the angle substended at centre by that arc which is r²(theta)/2.

So find the agles at each vertex and find the area of sector. Than subtract it from the area of triangle. To get the answer.

Approved