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kylieweeks052704
17.09.2021 •
Mathematics
40 points What kind of triangle is △BCD? Explain.
Triangle B C D sitting on line B D. At vertex B, angle 1 is exterior to the triangle and angle 2 is interior. Together, 1 and 2 form a straight angle. At vertex C, the interior angle measure is 70 degrees. At vertex D, the interior angle is not labeled and the exterior angle has measure 130 degrees.
Group of answer choices
Right triangle; m∠2 = 90
Isosceles triangle; m∠CDB = m∠2
Obtuse triangle; m∠CDB = 180 − 70 = 110
Acute triangle; m∠CDB = 180 − 130 = 50 and m∠2 = 180 − 70 − 50 = 60
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Ответ:
It must have the same slope as the given line, so
m = -A/B = -1/-2 = 1/2
So far, we have
y = mx + b = x/2 + b
Use the given point to find b.
4 = -2/2 + b = -1 + b
b = 5
y = x/2 + 5
Multiply through by 2.
2y = x + 10
Standard form:
x - 2y = -10