Question

Bisect a straight angle, using ruler and compasses. Measure each part.

Answer 1

• Draw a line I and mark a point O on it.
• With O as centre, draw arc with radius more than half of AB Such that it intersects line I at two-point A and B.
• Take A and B as centres, now with the same radius draw arcs such that they intersect each other at interior of angle a point C.
• Join OC.
• Thus, CO is required bisector of straight angle.

Measure bisected angle

On measuring the divided parts we get measure of each part

$={\left(\frac{180}{2}\right)}^o={90}^o$