In the ABC triangle, the angle C is 135 degrees, AC = 6 cm, the BO height is 2 dm. Find the ABD triangle.
January 31, 2021 | education
| It is known from the condition that in triangle ABC the angle is C = 135 °, AC = 6 cm, and the height of the ВO is 2 dm. We need to find the area of the triangle ABD.
Let’s start by finding the degree measure of angle B.
Angle С = 135 ° (according to the condition). Angle adjacent to angle C in triangle BCD = 45 ° (180 ° – 135 ° = 45 °).
Angle D – straight (90 °). We conclude that the second angle in this triangle is also 45 °, that is, the triangle is isosceles.
Therefore, BD = CD = 2.
It turns out AD = 6 + 2 = 8.
BD = 2AD, by the Pythagorean theorem = 2√17.
Area of triangle ABD:
S = 8 * 2 * 1/2 = 8 sq. units.
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