fernandofhn1844
13.03.2021 •
Mathematics
Complete the proof that the sum of a triangle's interior angle measures is 180°180 \degree180°180, degree.
StatementReason
1Construct DE↔\overleftrightarrow{DE}DE
D, E, with, \overleftrightarrow, on top through parallel to AC↔\overleftrightarrow{AC}AC
A, C, with, \overleftrightarrow, on top.Given a line, we can construct a parallel line through a point not on the given line.
2m∠A=m \angle A=m∠A=m, angle, A, equals
Alternate interior angles formed by parallel lines have equal measures.
3m∠B=65°m \angle B=65 \degreem∠B=65°m, angle, B, equals, 65, degreeGiven
4m∠C=m \angle C=m∠C=m, angle, C, equals
Alternate interior angles formed by parallel lines have equal measures.
5m∠A+m∠B+m∠C=180°m \angle A + m \angle B + m \angle C = 180 \degreem∠A+m∠B+m∠C=180°m, angle, A, plus, m, angle, B, plus, m, angle, C, equals, 180, degreeSubstitution and addition (2, 3, 4).
Did we prove the conclusion true for every triangle or only for this specific triangle?
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Ответ:
Answe180
Step-by-step explanation:
Ответ:
Given the statement: BE = 2x + 6 units and ED = 5x - 12 units.
By properties of parallelogram:
The parallelogram bisects each other at E.
You can see the diagram of parallelogram as shown below.
Therefore;
.....[1]
Substitute the given values we have;
Add 12 both sides we get;
Subtract 2x from both sides we have;
Divide 3 both sides we get;
x = 6.
BE = 2x+6 = 2(6)+6 = 12 +6 = 18 units
We have to find the value of BD:
BD = BE+ED
from [1] we have;
Therefore, the value of BD is, 36 units.