Questions where students often pick the tempting wrong answer — make sure you know the right one:
What is the formula for the area of a circle?✗ The area of a circle is 2 * pi * r — the same as the circumference formula.✓ pi * r^2 (pi times the radius squared).
In Pythagoras' theorem, which side does c^2 represent?✗ c^2 represents any side of the triangle as long as the other two are squared.✓ The hypotenuse — the longest side, opposite the right angle.
What is the relationship between the angle at the centre and the angle at the circumference subtended by the same arc?✗ The angles are equal because they are subtended by the same arc.✓ The angle at the centre is twice the angle at the circumference.
What is the sum of the interior angles of any pentagon?✗ 360 degrees, because all polygons' angles sum to one full turn.✓ 540 degrees — use (n - 2) x 180 with n = 5.
What is the difference between area and perimeter?✗ Area and perimeter are different names for the same measurement.✓ Perimeter is the total distance around the outside; area is the amount of surface inside (measured in square units).
Practise Geometry & Measures — free games
Test yourself with these quick revision games for this topic:
