Math Notes

Plane Geometry

2D geometry—triangles, quadrilaterals, circles—core theorems, angle chasing, area & perimeter.

Solved Problems

Topics
Circle
What is the area of the shaded region on the given figure?Calculate the area of the circle circumscribing an isosceles right triangle having an area of 242 mm<sup>2</sup>.
Area
A circle having a radius of 9 cm circumscribes a right triangle whose area is 43.23 sq. cm. If one of the sides is 18 cm long, find the other sides.A perimeter of a rectangle is 68 m and its diagonal is 26 m. What is the area of the rectangle?
Surface Area
A pyramid having a base of 5 cm and a perpendicular height of 20 cm. What is the total surface area?
Tags:
plane geometry Euclidean geometry triangles quadrilaterals circle theorems area perimeter similarity congruence