In the given fig.O is the centre of the circle. find the value of angleA.
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The triangle made in a semicircle is a right angled triangle always.
So the measure of triangle becomes 180 degrees.
Therefore, 55+90+x = 180
X= 35
So the measure of triangle becomes 180 degrees.
Therefore, 55+90+x = 180
X= 35
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Step-by-step explanation:
as AOB is diameter (o is centre of circle) the angle formed by diameter at point c is 90°
so angle ACB=90°
in triangle ABC
by angle sum property
angleA+55°+90°=180°
angleA+145°=180°
angleA=35°
hope it helps
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