Answer:
m∠ D = 39°
Step-by-step explanation:
sum of interior angles of a triangle= 180
180 - 102 = 78
78 / 2 = 39
Answer:
3.9 to the nearest tenth.
Step-by-step explanation:
Using the Pythagoras theorem for a right triangle:
8^2 = 7^2 + x^2
x^2 = 64 - 49 = 15
x = √15 = 3.87298
Step-by-step explanation:
The attached figure shows two triangles AOB and MON.
In triangles AOB and MON,
AB = MN (Given )
∠AOB = ∠MON (vertically opposite angles)
∠O = ∠O (common)
∴ ΔAOB ≅ Δ MON (ASA)
Angle-side-angle is the postulate that can be used to prove that two triangles are congruent.