Geometrymedium · Past Paper
If in triangle ABC, angle C is right angle, then cos^2 A + cos^2 B is:
A0
B1
C2
D0.5
✓ Correct Answer: B — 1
A + B = 90, so cos B = sin A. cos^2 A + sin^2 A = 1.
Share this question
More from Geometry
- Calculate the value of x if (5x - 5) and (2x + 10) are angles on a straight line.
- Find the area of a circle whose circumference is 22 cm.
- In a circle of radius 5 cm, AB and CD are two parallel chords of length 8 cm and 6 cm respectively. If they lie on opposite sides of the center, find the distance between them.
- What is the slope of a line which is perpendicular to the Y-axis?
- The area of a circle inscribed in a square of side 10 cm is: