# Khan Academy

# Khan Academy

by jake murray
# 1. Protractor

## 1.1. The vertex of the angle goes on the center point of the protractor

## 1.2. Each "ticky" mark on the protractor is exactly one degree

### 1.2.1. In deeper math, each degree is known as a radian

# 2. Acute Angle

## 2.1. An angle that's greater than 90 degrees

# 3. Obtuse Angle

## 3.1. An angle that's greater than 90 degrees

# 4. Right Angle

## 4.1. An angle that's exactly 90 degrees

# 5. The more degrees, the more open the angle is

## 5.1. Some are more open/closed than others

# 6. Angle

## 6.1. When 2 rays share a common vertex

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