# Rectangle

See how to solve a rectangle

(sides/diagonals/area).

3 examples and their solutions.

## Rectangle: Definition

### Definition

whose interior angles are all right angles: 90°.

So a rectangle

has all the properties of a parallelogram.

## Rectangle: Sides

### Property

(also true for a parallelogram)

### Example

Rectangle ABCD

AC = ?

Solution AC = ?

## Rectangle: Diagonals

### Property

### Example

↓

x4 = 105 - [2]

x4 = 2

x = 8

[1]

(6, x, 10)

→ ×2 of (3, 4, 5)

→ So draw (3, 4, 5) right triangle

next to the given triangle.

Pythagorean Triples

→ ×2 of (3, 4, 5)

→ So draw (3, 4, 5) right triangle

next to the given triangle.

Pythagorean Triples

[2]

Close

## Rectangle: Area

### Formula

A = bh

### Example

A = 7⋅5

= 35

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