Question

construct a triangle in which AB=AC=6cm and angle B = angle C = 70 degree. measure angle A​

Answer 1

Step-by-step explanation:

the measure of angle A is 180°

Answer 2

The angle A is 40 degree.

That is $\angle A=40^{\circ}$

Step-by-step explanation:

Given that a triangle in which AB=AC=6 cm and angle B = angle C=70 degree.

To measure the angle A​ :

Let ABC be the triangle.

Also given that AB=AC=6 cm and angle B=70 degree and angle C=70 degree

First construct a triangle ABC :

• Draw a line segment AB of 6 cm and then draw another line segment AC  of 6 cm from A.
• Now join the the vertices B and C
• Mark the measurements  angle B=70 degree and angle C=70 degree

That is $\angle B=70^{\circ}$ and  $\angle C=70^{\circ}$

We know that the Sum of the interior angles in a triangle is $180^{\circ}$

• Therefore $\angle A+\angle B+\angle C=180^{\circ}$
• $\angle A+70^{\circ}+70^{\circ}=180^{\circ}$

$\angle A=180^{\circ}-140^{\circ}$

$\angle A=40^{\circ}$

Therefore the angle A is 40 degree