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12 questions from this quiz
Vertical height
12รbรh\frac{1}{2} \times b \times h21โรbรh
bรhb \times hbรh
12(a+b)รh\frac{1}{2}(a + b) \times h21โ(a+b)รh
Split into basic shapes & add areas
ฯr2\pi r^2ฯr2
2ฯr2\pi r2ฯr
3.1423.1423.142
x360รฯr2\frac{x}{360} \times \pi r^2360xโรฯr2
x360ร2ฯr\frac{x}{360} \times 2\pi r360xโร2ฯr
Sector area - Triangle area
Include straight edges & curved part
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