# Isosceles

Isosceles trapezium ABCD ABC = 12 angle ABC = 40 ° b=6. Calculate the circumference and area.

### Correct answer:

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Calculation of an isosceles triangle.

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Calculation of an isosceles triangle.

See also our trigonometric triangle calculator.

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

**algebra**- expression of a variable from the formula
**planimetrics**- Pythagorean theorem
- right triangle
- area of a shape
- perimeter
- triangle
- trapezoid

#### Units of physical quantities:

#### Grade of the word problem:

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