# Isosceles 81130

The angle at the apex of an isosceles triangle is 78°. Base 28.5cm. Shoulder length?

### Correct answer:

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Calculation of an isosceles triangle.

See also our trigonometric triangle calculator.

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

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

**algebra**- expression of a variable from the formula
**planimetrics**- triangle
**goniometry and trigonometry**- tangent
- cotangent

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#### Grade of the word problem:

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