21V(v)(iv)Find the measure of the third angle of triangles whose two a

1.	21V(v)(iv)Find the measure of the third angle of triangles whose two angles are given below(1) 38°, 102 (ii) 116°, 30° (iii) 40", 80°In a right-angled triangle, one acute angle is 30°. Find the other acute angle.
Answer» (I)38°,102°Let the other angle be xsum of angle of a ∆le is 180°38°+102°+x=180°x=180°-140°=40° (ii) 116°,30°Let the other angle be xsum of angle of a ∆le is 180°116°+30°+x=180°x=180°-146°=34° (III)40°,80° Let the other angle be xsum of angle of a ∆le is 180°40°+80°+x=180°x=180°-120°=60°

21V(v)(iv)Find the measure of the third angle of triangles whose two angles are given below(1) 38°, 102 (ii) 116°, 30° (iii) 40", 80°In a right-angled triangle, one acute angle is 30°. Find the other acute angle.

Answer»

(I)38°,102°Let the other angle be xsum of angle of a ∆le is 180°38°+102°+x=180°x=180°-140°=40°

(ii) 116°,30°Let the other angle be xsum of angle of a ∆le is 180°116°+30°+x=180°x=180°-146°=34°

(III)40°,80°

Let the other angle be xsum of angle of a ∆le is 180°40°+80°+x=180°x=180°-120°=60°