Prove that if one angle of a triangle is...

Prove that if one angle of a triangle is equal to the sum of the other two angles, the triangle is right angled.

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MODERN PUBLICATION-LINES AND ANGLES-EXERCISE

In the fig. ABCD is a quadrilateral in which AB||DC and AD||BC prove t...
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Two lines are perpendicular to the same line are ......... to each oth...
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Prove that if one angle of a triangle is equal to the sum of the other...
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Two lines AB and CD intersect at O. if angleAOC+angleCOB+angleBOD=270^...
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In the fig. p is a transversal to lines m and angle2=120^@ and angle5=...
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If l,m and n are three straight lines such that l||m and l||n then pro...
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In the fig. arms BA and BC of angleABC respectively parallel to arms B...
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In triangleABC, if angleB=76^@, and angleC=48^@ find angleA
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In triangleABC, if angleA=55^@, angleB=40^@ find angleC
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In triangleABC, if angleA+angleB=108^@ and angleB+angleC=109^@, find a...
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Two angles of a triangle are equal and the third angle is greater than...
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The sum of two angles of a triangle is 116^@ and difference is 24^@. F...
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In a right angled triangle one of the acute angle measures 53^@, find ...
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If each angle of a triangle is less than the sum and other two, show t...
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The exterior angles,bounded obtained on producing of a triangle of bot...
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In the fig side BC of triangleABC is produced to angleACD=128^@ and an...
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Calculate the value of x in each of the following figures
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Calculate the value of x in each of the following figures
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Calculate the value of x in each of the following figures
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Calculate the value of x in each of the following figures
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