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In the given figure, if l//m , then what type of a triangle is ABC ? A. EquilateralB. IsoscelesC. ScaleneD. Right angled. |
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Answer» Correct Answer - B Given `l||m` , `angleBCA=angleDEC=80^(@)` ( corresponding angles ) `angleCBA=angleEDB=50^(@)` ( corresponding angles ) `angleBCA+angleCBA+angleBAC=180^(@)` `implies 80^(@)+50^(@)+angleBAC=180^(@)` `implies angleBAC=50^(@)` `:.` In `DeltaABC, angleA=angleB=50` `implies DeltaABC` is isosceles. Hence, the correct option is (b). |
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