Question

Please help me to know the answer



Hope you will give me answer

Answer 1

first see the measurement of AOC and it must not be <AOC it must be diameter because it passed from the center
if it is angle then <ABC=90°
then <AOC=180°
<ABC=1/2×<AOC
<ABC=1/2×180°
<ABC=90°

Answer 2

Answer:

Step-by-step explanation:

angle subtended by semicircle is 90

so <abc = 90

aoc is a straight line

so <aoc = 180

180/2 = 90

so <abc = <aoc/2