Explanation

• An angle inscribed in a semicircle is always 90° due to the Thales' Theorem.
• It is called a right angle because the angle subtended by a diameter is always right.

Last verified on 06-05-2026

Explanation

Area = ½ × base × height  

If areas are equal and bases are equal:  

½ × b × h₁ = ½ × b × h₂  

So h₁ = h₂  

Last verified on 06-05-2026

Explanation

Sum of angles in a triangle = 180°  

40° + 60° = 100°  

Third angle = 180° - 100° = 80°  

Last verified on 06-05-2026

Explanation

• In geometry, a tangent is a line that touches a circle at only one point.
• At the point of contact, it forms a right angle (90°).
• The tangent is always perpendicular to the radius of the circle.

Last verified on 04-05-2026

Explanation

Given that the radius of a circle is increased to twice its original length

We have to find the increase in the area of the circle

Area of circle = πr²

Where r is the radius of the circle

Now, r = 2r

Area of circle = π(2r)²

= 4πr²

Last updated by NA on 27 April 2026