Question 1 - Page 154 - Area of Triangle - Chapter 7 Class 8 - Area (Ganita Prakash II)

Transcript

Question 1 - Page 154 Will this formula hold for the kind of triangle, around which we cannot draw a rectangle with BC as the base? If we draw perpendicular from A on BC It is outside the triangle Now, we can write Area ∆ ABC as Area of ∆ ABC = Area of ∆ ADC – Area of ∆ ADB = 1/2 × DC × AD – 1/2 × DB × AD = 𝟏/𝟐 × AD × (DC – DB) Since DC – DB = BC = 𝟏/𝟐 × AD × BC So, it doesn’t matter if the height is outside the triangle, our formula remains the same