My Math Forum  

Go Back   My Math Forum > High School Math Forum > Geometry

Geometry Geometry Math Forum


Thanks Tree1Thanks
  • 1 Post By skeeter
Reply
 
LinkBack Thread Tools Display Modes
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.
yorkmanz is offline  
 
May 14th, 2019, 03:37 PM   #2
Math Team
 
skeeter's Avatar
 
Joined: Jul 2011
From: Texas

Posts: 3,034
Thanks: 1621

Area of triangle + Area of rectangle = Area of arrow
Attached Images
File Type: jpg composite_area.jpg (15.7 KB, 4 views)
Thanks from idontknow
skeeter is online now  
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?
yorkmanz is offline  
May 15th, 2019, 06:00 AM   #4
Math Team
 
skeeter's Avatar
 
Joined: Jul 2011
From: Texas

Posts: 3,034
Thanks: 1621

Quote:
Originally Posted by yorkmanz View Post
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
skeeter is online now  
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
skipjack is offline  
Reply

  My Math Forum > High School Math Forum > Geometry

Tags
area, arrow



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculating the points of an arrow mathboy123 Trigonometry 2 September 27th, 2018 08:51 AM
Zeno's Arrow Paradox zylo Math 2 January 13th, 2016 08:26 AM
count arrow flight distance gju7 Algebra 14 August 18th, 2015 11:32 PM
Showing right arrow Chikis LaTex Help 5 July 1st, 2014 07:46 PM
Arrow's theorem and social choice CRGreathouse Economics 1 January 11th, 2008 08:05 AM





Copyright © 2019 My Math Forum. All rights reserved.