GCSE Secondary Maths Age 13-17 - Geometry & Measures: Isosceles Triangle - Explained

What is the initial condition given for triangle ABC?

• AB is equal to AC

• BA is equal to BC

• AB is equal to CD

• BC is equal to CA

What must be shown to prove that triangle BCD is isosceles?

• All angles are equal

• Two sides are equal

• All sides are equal

• Two angles are equal

What is the measure of angle ADB in triangle ABD?

• 72 degrees

• 144 degrees

• 108 degrees

• 36 degrees

How is the angle DBC calculated in triangle BCD?

• By subtracting 72 from 180

• By adding 36 to 72

• By adding 72 to 36

• By subtracting 72 from 108

What is the significance of finding two equal angles in triangle BCD?

• It proves the triangle is scalene

• It proves the triangle is isosceles

• It proves the triangle is right-angled

• It proves the triangle is equilateral

What is the final angle measure found for angle ABC in triangle ABC?

• 108 degrees

• 72 degrees

• 180 degrees

• 36 degrees

What is emphasized as crucial for mastering the concepts discussed?

• Reading textbooks

• Memorizing formulas

• Practicing regularly

• Attending lectures