Middleschool12K
Middleschool12K Middleschool12K
  • 25-10-2021
  • Mathematics
contestada

please help me, what is this

please help me what is this class=

Respuesta :

Magma785
Magma785 Magma785
  • 25-10-2021

Answer:

Proof:

In ΔCDB

∵ The sum of all angles of triangle = 180°

∴ m∠B + m∠C + m∠D = 180°

R3. Their sum = 180 (They form straight angle)

S4. ∠B + ∠A = 180°

R5. Triangle angle sum theorem (Sum of all angles of triangle = 180°)

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