Question

Write down the size of angle ABC. Give a reason for your answer.

Answer 1

Angle ABC is 90 degrees, as it is an angle in a semicircle.

Answer 2

Answer:

90 degrees

Step-by-step explanation:

AC is a diameter. So, ABC must be a semicircle (Diameter divides the circle into two equal parts)

=> So, <ABC = 90 degrees

Because, A triangle inscribed in a semicircle will must have a 90 degrees angle opposite to the diameter.