Eagles/Doves - Q22 RAR

Date: 17th Apr 2020 @ 9:34am

RAR:

Hi everyone, well done to those who completed yesterday’s home learning.

When looking through the results, I noticed that Q22 had proven particularly tricky – it was answered incorrectly 71 times! So I thought I would do a little explanation and set a similar question for you to have a go at – a RAR!!!

 

Q22.

So we know:

 

Step 1:

To get the final answer of 36 cm2 we divide by 2. Most of you realised that by using the inverse operation, 36 x 2, it would give you the product of b x h (72).

(The Khan Academy video link I added also explains how your knowledge of area of parallelograms, and a triangle being half of a parallelogram, can help here too).

Step 2:

What is the greatest possible height of the triangle?

So right now we’re looking at b x h = 72.

So we need to find factor pairs of 72. If we do this systematically (as you’ve been shown!) then you your first pair would be 1 & 72. Are you going to find a larger number than 72 that goes into 72? No. So straight away, the greatest possible height of our triangle is 72.

 

See below:

RAR:

 

Blog your answers!!!

Mr Simpson