Question

What is the value of x?
Answer options: 225, 135, 90, 180

Answer 1

180°

Explanation:

The angle subtended by the arc is calculated as follows. The angle made at the center by an arc is twice the angle subtended at the circumference.

In the figure the angle subtended at the circumference by the arc is a right angle, that is, 90° thus the angle that subtends the arc is 2×90=180°

Answer 2

180

Explanation:

We can use the central angle theorem to understand this problem.

The Central Angle Theorem states that the inscribed angle that fall on the opposite side of the circumference is half of the arc subtended by it.

The angle that is on the opposite side of the circumference is a right angle and thus it measures 90°. This is half of the arc labeled x. So x is twice that of 90.

So, x = 180 degrees