What is the initial problem statement involving quadrilateral ABCD?
GCSE Secondary Maths Age 13-17 - Algebra: Cosine Rule - Explained

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Mathematics
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10th - 12th Grade
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Prove that AC is equal to BD
Prove that ABCD is a rectangle
Prove that AB is equal to CD
Prove that angle ABC is equal to angle BCD
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why does the speaker separate the quadrilateral into two triangles?
To change the problem statement
To simplify the proof process
To prove that ABCD is a square
To make the diagram more complex
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which condition of congruency is used to prove the triangles are congruent?
Right Angle-Hypotenuse-Side
Side-Angle-Side
Angle-Side-Angle
Side-Side-Side
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the significance of the common side BC in the proof?
It is irrelevant to the proof
It helps in proving the triangles are congruent
It shows that AC is longer than BD
It proves that ABCD is a parallelogram
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What conclusion is drawn from the congruency of the triangles?
AB is equal to CD
AC is longer than BD
Angle ABC is equal to angle BCD
AC is equal to BD
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is NOT a condition of congruency?
Side-Angle-Side
Side-Side-Side
Angle-Angle-Angle
Angle-Side-Angle
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the easiest way to approach the problem according to the speaker?
By using a calculator
By assuming AC is equal to BD
By separating the quadrilateral into two triangles
By drawing the original diagram
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