We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
0
75
1
avatar

This is a geometry find the area question so I attached a link to the pdf where I got it from it's number 13 on page 2 chapter 11 test, form 3 and I am very confused. I have already figured out that the radius has to be 1.5 but I don't know how the answer is supposed to be 24.3!!! https://www.methacton.org/cms/lib/PA01000176/Centricity/Domain/149/Review%2011%20to%20%2013.pdf

 

Thanks in advance!

 Apr 14, 2019
 #1
avatar+101739 
+1

Radius of semi-circle  = 1.5 cm

Area of   semi-circle  =  pi (1.5)^2  / 2      (1)

 

Area of rectangle  = 3 * (6.5 - 1.5)  = 3 * 5  = 15      (2)

 

Area of triangle

One leg = 5cm

The other   =  √[5.5^2 - 5^2 ]   = √5.25  cm    

Area of  triangle = (1/2) product of the legs  = (1/2)(5)√5.25    (3)

 

Add (1) + (2) + (3)   ≈   24.12  cm^2 

 

 

cool cool cool  

 Apr 14, 2019
edited by CPhill  Apr 14, 2019

15 Online Users

avatar
avatar
avatar
avatar