In the image, triangle is the right triangle or not?



In the image, triangle is the right triangle or not?

 In a triangle, $α=55°,β=90°.$

Is the triangle is the right triangle or not?

    What is the value of right angle?

In the image, triangle is the right triangle or not?

In a triangle, $α=30°,β=60°$

Is the triangle is the right triangle or not?

In the image, triangle is the right triangle or not?



In a triangle, $α=45°,β=45°.$ Is the triangle is the right triangle or not?

In a triangle, $α=70°,β=20°.$ Is the triangle is the right triangle or not?

When you add up all of the angles in a triangle, what is the total?