A right angled triangle,
A square, rectangle, a right trapezium,
Selected versions of irregular polygons with 5 or more sides.
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Regular shapes are shapes where all the sides and angles are equal. One example of a regular shape is a square because all the sides are the same and all the angles are 90 degrees.
A 23-degree angle is classified as an acute angle, as it measures less than 90 degrees. Acute angles are commonly found in geometric shapes such as triangles and rectangles. In trigonometry, acute angles are essential for calculating various properties of triangles and other geometric figures.
90 degrees
A 67 degree angle would be acute. Acute angles are smaller that 90 degrees. Right angles are 90 degrees. Obtuse angles are more that 90 degrees. Straight angles are 180 degrees.
Complementary angles add up to 90 degrees