Save guides, add subjects and pick up where you left off with your BBC account. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles.

equations that are always true. Each trigonometric function also has an inverse that can be used to find an angle from a ratio of sides. The inverses of sin(x), cos(x), and tan(x), are arcsin(x ...

For a right-angled triangle, follow these steps to calculate the length of a side, \(x\), when another side and an angle Ɵ is given: Formula triangles ... there is a small D at the top of the ...