In an isosceles triangle ABC, it is known that BC = CA = 8√3. What is the height dropped to AB if tg A = √3?
January 28, 2021 | education
| 1. Let us denote by HH the height drawn to the side AB of the triangle ABC.
2. The angle BAC, the tangent of which is √3, is 60 °.
3. According to the properties of an isosceles triangle, the angles at its base are equal, that is
angle BAC = ABC = 60 °.
4. Angle АСВ = 180 ° – 60 ° – 60 ° = 60 °.
5. All angles of the triangle are equal, therefore it is equilateral:
AB = BC = AC = 8√3 cm.
6. We calculate the length of the CH height through the sine of the angle BAC:
CH / AC = sine 60 = √3 / 2.
CH = AC x √3 / 2 = 8√3 x √3 / 2 = 12 cm.
Answer: height CH = 12 cm.
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