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181. In ∆ABC, the bisectors of ∠ABC and ∠BCA intersect each other at 0. The measure of ∠BOC is:

$90 degree plus angle straight A$
$180 degree plus angle straight A$
$90 degree plus fraction numerator angle straight A over denominator 2 end fraction$
$90 degree plus fraction numerator angle straight A over denominator 2 end fraction$

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182. In ∆ABC, ∠A = 50° and the external bisectors of ∠B and ∠C meet at O as shown in figure. The measure of ∠BOC is:

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183. In figure, AB and CD are parallel to each other. The value of x is:

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75°

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185. Two lines are respectively perpendicular to two perpendicular lines then these two lines to each other are:

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186. If l, m, n are lines in the same plane such that l intersects m and n || m, then l and n are:

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187. If two parallel lines are intersected by a transversal, then corresponding angles are:

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188. Two complementary angles are in the ratio 4 : 5 the angles are:

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189. Find the measure of the angle which is supplement of itself:

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190. Two angles measure (30 - a)° and (125 + 2a)°. If each one is the supplement of the other, then the value of a is:

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