# A rectangle 5

A rectangle has sides of 10 cm and 14 cm. Calculate the angle between a diagonal and a long side.

## Correct answer:

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Try conversion angle units angle degrees, minutes, seconds, radians, grads.

### You need to know the following knowledge to solve this word math problem:

**arithmetic**- square root
**planimetrics**- right triangle
- triangle
- diagonal
- rectangle
**goniometry and trigonometry**- cosine
- arccosine

### Units of physical quantities:

### Grade of the word problem:

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