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 ...

Written inside the triangle: equal lengths. The two equal sides and hash marks are coloured orange. , Hash marks are used to show edges that are equal in length.

You can see that there are two sides which have an equal length of 7cm. This means that this triangle is isosceles. An isosceles triangle has two sides that are congruent (equal) in length. Even ...