Diantara tiga-tigaan bilangan berikut yang merupakan segitiga lancip adalah ... *
21, 20, 29
8, 11, √175
50, 48, 14
12, 15, 21
Diantara tiga-tigaanl
Answers
Given : Sides of triangle
21, 20, 29
8, 11, √175
50, 48, 14
12, 15, 21
To Find : Type of Triangle
Solution:
a , b , c are sides of triangle and c is the largest side
obtuse angles triangle
a² + b² < c²
right angled triangle
a² + b² = c²
acute angles triangle
a² + b² > c²
21, 20, 29
21² + 20² = 441 + 400 = 841 = 29²
Right angles triangle
8, 11, √175
8² + 11² =64 + 121 = 175 = (√175 )²
Right angled triangle
50, 48, 14
14² + 48² = 50² Right angled triangle
12, 15, 21
12² + 15² = 144 + 225 = 369
21² = 441
369 < 441
obtuse angles triangle
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