---
id: 699e5b9e8f18cf77dfce5c0e
title: Sine and Cosine of Special Angles
challengeType: 11
videoId: X0Bh-NiQ3KQ
dashedName: sine-cosine-special-angles
---

# --description--

In this video, you will learn how to find the sine and cosine of special angles, such as 30°, 45°, and 60°. 

# --questions--

## --text--

What is the cosine of 45° for a right triangle with the hypotenuse of length 5?

## --answers--

$\frac{\sqrt{3}}{2}$

---

$\frac{\sqrt{5}}{5}$

---

$\frac{1}{\sqrt{2}}$

---

$\frac{\sqrt{2}}{2}$

## --video-solution--

4


