solve the question number 2
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you can undrstand it if u learn triangles theorem deeply
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GIVEN
BD = 7
BC = 20
Therefore, DC = 20 - 7 = 13
DRAW A VERTICAL LINE FROM POINT 'A' POINT E ON BASE BC.
This vertical line is a height or altitude and it is always perpendicular to base. Means form 90 degree.
FORMULA
Area of triangle = 1/2 x (height x base)
CASE 1.
ar ABD / ar ADC
= 1/2 (AE x BD) / 1/2(AE x DC)
= BD / DC
= 7 / 13
CASE 2.
ar ABD / ar ABC
= 1/2 (AE x BD) / 1/2(AE x BC)
= BD / BC
= 7 / 20
CASE 3.
ar ADC / ar ABC
= 1/2 (AE x DC) / 1/2(AE x BD)
= DC / BD
= 13 / 7
BD = 7
BC = 20
Therefore, DC = 20 - 7 = 13
DRAW A VERTICAL LINE FROM POINT 'A' POINT E ON BASE BC.
This vertical line is a height or altitude and it is always perpendicular to base. Means form 90 degree.
FORMULA
Area of triangle = 1/2 x (height x base)
CASE 1.
ar ABD / ar ADC
= 1/2 (AE x BD) / 1/2(AE x DC)
= BD / DC
= 7 / 13
CASE 2.
ar ABD / ar ABC
= 1/2 (AE x BD) / 1/2(AE x BC)
= BD / BC
= 7 / 20
CASE 3.
ar ADC / ar ABC
= 1/2 (AE x DC) / 1/2(AE x BD)
= DC / BD
= 13 / 7
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