Question

Which dimensions can create only one unique triangle?

Answer 1

Answer: B.Three sides measuring 14 m,11 m,and 18 m

Step-by-step explanation:

Let's check all the option.

A. Three angles measuring 75,45,and 50

We know that the sum of all angles of a triangle is 180°.

But $75+45+50=170$ Therefore triangle is not possible with this dimensions of angles.

B. Three sides measuring 14 m,11 m,and 18 m

• For a unique triangle, the  triangle inequality says that the sum of any two sides of a triangle must be greater than the third side.

Here ,

$14+11=25>18\\18+14=32>11\\11+18=29>14$

⇒ It satisfies the triangle inequality.

∴ There is one unique triangle of dimensions 14 m,11 m,and 18 m

.

C.Three angles measuring 40,50 and 60.

.

But $40+50+60=150$ Therefore triangle is not possible with this dimensions of angles.

D.Three sides measuring 3 cm,4 cm,and 8 cm

Here , $3+4=7$

Hence, it does not satisfies the triangle inequality.

Answer 2

The correct answer is B.

Good luck!!!