ABCD is a quadrilateral.
According to the data, calculate the size of .
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ABCD is a quadrilateral.
According to the data, calculate the size of .
As we know, the sum of the angles in a square is equal to 360 degrees, therefore:
We replace the data we have in the previous formula:
Rearrange the sides and use the appropriate sign:
50
Find the measure of the angle \( \alpha \)
A quadrilateral can be divided into two triangles by drawing a diagonal. Since each triangle has angles summing to 180°, the quadrilateral total is 2 × 180° = 360°.
Yes! Whether it's a square, rectangle, rhombus, trapezoid, or irregular quadrilateral, the interior angles always sum to 360°. The shape doesn't matter!
Look for right angle symbols (small squares) which indicate 90°. Also check if any sides are marked as parallel, which can help you identify equal angles.
Follow the vertices in alphabetical order: A → B → C → D. The angle at vertex B is the interior angle formed by sides AB and BC meeting at point B.
Be careful! This method only works with interior angles. If you have an exterior angle, first convert it: interior angle = 180° - exterior angle.
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