Question

Write down the size of angle ABC.

Give a reason for your answer.
angle ABC = Answ
Give a reason

Answer 1

90°

it is half the measure of the semicircular arc AC

Explanation:

You want the measure of angle ABC inscribed in a semicircle.

Inscribed angle

An inscribed angle has half the measure of the arc it subtends. Angle ABC subtends a semicircle, an arc of 180°, so its measure is 180°/2 = 90°.

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