Brainlag PlusAnswers in terms of π, surds kept exact, standard form by hand, and powers and roots of numbers you can work out in your head.
Leave π in the answer
"Give your answer in terms of π" means do not multiply by 3.14.
The answer 36π is exact; 113.04 is rounded.
- A semicircle with diameter 10 cm
- radius = 5 cm
- area = ½ × π × 5² = 12.5π cm²
- perimeter = ½ × π × 10 + 10 = 5π + 10 cm
The rest of this lesson and its 9 practice questions are in Plus.
Screen 1 of 5, free to read.
- 9 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards