# Black building

Keith built building with a rectangular shape 6.5 m × 3.9 m. Calculate how much percent exceeded the limit 25 m

^{2}for a small building. A building not built by the law is called a "black building". Calculate the angle that the walls were clenching each other to meet the limit footprint limit 25 m^{2}with given lengths of the walls if it stands angular.## Correct answer:

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Most natural application of trigonometry and trigonometric functions is a calculation of the triangles. Common and less common calculations of different types of triangles offers our triangle calculator. Word trigonometry comes from Greek and literally means triangle calculation.

Do you want to convert length units?

Most natural application of trigonometry and trigonometric functions is a calculation of the triangles. Common and less common calculations of different types of triangles offers our triangle calculator. Word trigonometry comes from Greek and literally means triangle calculation.

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

**planimetrics**- area of a shape
- rectangle
- rhomboid
**basic functions**- percentages
**goniometry and trigonometry**- sine
- arcsine

### Units of physical quantities:

### Grade of the word problem:

We encourage you to watch this tutorial video on this math problem: video1

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