In a right-angled triangle, the sum of all angles is always 180°. Since one angle is 90°, the sum of the other two angles must be 180° - 90° = 90°.
Therefore, the sum of the other two angles is 90°, and one angle is given as 65°, so the third angle must be 90° - 65° = 25°.
The size of the third angle is 25°.
A right-angled triangle contains an angle of 65°. What is the size of the third angle?
1 answer
1 answer