nnsnsnnsns nnsnsnnsns

22-11-2017
Mathematics

contestada

Given: Triangles ABC and DBC are isosceles, m∠BDC = 30°, and m∠ABD = 155°. Find m∠ABC, m∠BAC, and m∠DBC.

Respuesta :

tynollette tynollette

22-11-2017

∠BDC=30, so ∠CBD + ∠BCD=180-30=150
ΔDBC is isosceles, so ∠CBD=∠BCD=half of 150=75
∠ABC=∠ABD-∠CBD=155-75=80
ΔABC is isosceles, so ∠ABC=∠ACB=80
∠BAC=180-80-80=20

Answer Link

Otras preguntas

A pool can be filled by one pipe in 4 hours and by a second pipe in 12 hours. How long will it take using both pipes to fill the pool?

The islets of __________ are the hormone-producing structures in the pancreas that manufacture insulin and __________.

Which racial or ethnic group compromises the largest percentage of texas population?

Find the volume of the square pyramid with length 14.7 inches and height 18 inches.

In the 15th century, the single-sheet ancestors of today's brochures and newspapers were called _____.

Software development process that develops software iteratively with a heavy emphasis on construction activities is known as

True or false: (a) the induced emf in a circuit is proportional to the magnetic flux through the circuit.

The seatbelt across your chest should have about ________ fist width of slack.

The healthy fitness zones (HFZs) for teenagers include which components of health-related fitness? (Choose all that apply.) A. cardiorespiratory endurance B. mu

What part of the body transports oxygen, removes waste materials and carries nutrients