My Math Forum area of the arrow

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 May 14th, 2019, 02:50 PM #1 Member   Joined: Jan 2019 From: tornto Posts: 48 Thanks: 0 area of the arrow Area of the arrow Determine the area of the arrow from a one-way street sign, given the dimensions below. image: What's the formula? How to solve it? Thanks. Last edited by skipjack; May 15th, 2019 at 12:48 PM.
May 14th, 2019, 03:37 PM   #2
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Area of triangle + Area of rectangle = Area of arrow
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 May 14th, 2019, 09:45 PM #3 Member   Joined: Jan 2019 From: tornto Posts: 48 Thanks: 0 beginning to the end of the arrow so 1/2 (30+30+75 * 90)= 3405? right?
May 15th, 2019, 06:00 AM   #4
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Quote:
 Originally Posted by yorkmanz beginning to the end of the arrow so 1/2 (30+30+75 * 90)= 3405? right?
no ...

triangle area = $\dfrac{1}{2}(30+30+75)(90) = \dfrac{1}{2}(135)(90) \ne 3405$

... try again

 May 15th, 2019, 01:04 PM #5 Global Moderator   Joined: Dec 2006 Posts: 21,034 Thanks: 2271 Area(triangle) = base × height / 2 = (30 + 30 + 75) cm × (90/2) cm = 6075 cm² Area(rectangle) = 300 cm × 75 cm = 22500 cm² Total area = 28575 cm²

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### formula for the area of an arrow

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