+0  
 
+1
455
1
avatar+190 

What is the area of △PQR.

Enter your answer as a decimal in the box. Round only your final answer to the nearest tenth.

 

 

Thank You So Much In Advance!!! 

KennedyPape  Mar 27, 2018
 #1
avatar+7153 
+2

Let  QR  be the base of the triangle.

Let's draw a height from  QR  to  P .

 

 

Now we have a right triangle.

 

sin( angle )  =  opposite / hypotenuse

 

sin 20°  =  h / 9

                            Multiply both sides of the equation by  9 .

9 sin 20°  =  h

 

h  =  9 sin 20°

 

Now we know the base and the height, so we can find the area.

 

area  =  (1/2)(base)(height)

 

area  =  (1/2)(14)(9 sin 20°)   square cm

 

area  =  63 sin 20°   square cm

 

area  ≈  21.5   square cm

hectictar  Mar 27, 2018

6 Online Users

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.