Call their intersection C. Now we’ve got a triangle, and now we can apply the triangle angle sum theorem. The third angle must measure 180 − (41 + 76) = 63, and so ABC is exactly the triangle we were ...

Triangles up to 180 degrees slideshow Click to see a step-by-step slideshow. WHAT YOU NEED: piece of card/paper, ruler, scissors and pen.

The three angles in a triangle add up to \(180^\circ\). If two of the angles are known then the third can be calculated by following these steps: Add the two known angles together. Subtract the ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. What is a triangle? We all know that a triangle is a three-sided shape — 1, 2, 3 sides. A ...

Can be proved. In spherical geometry, straight lines describe great circles, triangles have a bulging shape, and the sum of the three corners is more than 180 degrees.