Classify the following triangles according to measures of angles.
$40 °, 90 °, 50 °$

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Solution

Given,
$40 °, 90 °, 50 °$
One angle $= 40 °$
Second angle $= 90 °$
Third angle = $50 °$
As, two angles of a triangle are acute and one is right angle.
“An acute angle is an angle which is less than $90 °$ .
$∴$ Triangle is a right-angled triangle as one angle is $90 °$ .

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