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secondary 3 | A Maths
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Need help with last part!!
Date Posted: 6 years ago
Views: 646
You can find the height of the two triangles using the formula 1/2 x base x height. The total height of the two triangle will give the height of the trapezium. You can then find the area of the trapezium with the two lengths and height.
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Ok. So there are 3 steps. Step 1 using length of simillar triangle since the smaller triangle is 3 cm and the bigger one is 9 cm its ratio is 1:3 . Step 2 finding area ratio hence is 1:9 as you square both ratios then using the 7 cm as the area of traingle aeb you can find the bigger triangle which 63 cm square. Lastly use trapezium formula 1/2 × sum of parallel sides therefore i used 1/2 × 3×9= 13.5. And now you can use the area of bigger triangle over the trapezium area which is 63/13.5 which is 14/3. As you use 63 divided by 13.5 to find the ratio.
Date Posted:
6 years ago
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