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Question

Find the measures of the third angle of each of the triangle.
(i) 40°, 75°, ......
(ii) 45°, 45°, ......
(iii) 110°, 23°, .....
(iv) 90°, 10°, ....
(v) 51°, 113°, ....
(vi) 92°, 27°, ....

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Solution

(i) Let the third angle be x. According to the angle sum property, we have:40°+75°+x=180°x= 65°(ii) Let the third angle be x According to the angle sum property, we have:45°+45°+x=180°x= 90°(iii) Let the third angle be x.According to the angle sum property, we have:110°+23°+x=180°x= 47°(iv) Let the third angle be x. According to the angle sum property, we have:90°+10°+x=180°x= 80°(v) Let the third angle be x. According to the angle sum property, we have:51°+113°+x=180°x= 16°(vi) Let the third angle be x. According to the angle sum property, we have:92°+27°+x=180°x= 61°

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