Forum

Triangles

In ∆ ABC, AB = AC and ∠B = 50°. Then ∠C is equal to
(A) 40° (B) 50° (C) 80° (D) 130°

05/11/2024

Mathematics

9th

Triangles

If AB = QR, BC = PR and CA = PQ, then
(A) ∆ ABC ≅ ∆ PQR (B) ∆ CBA ≅ ∆ PRQ
(C) ∆ BAC ≅ ∆ RPQ (D) ∆ PQR ≅ ∆ BCA

05/11/2024

Mathematics

9th

Triangles

Which of the following is not a criterion for congruence of triangles?
(A) SAS (B) ASA (C) SSA (D) SSS

05/11/2024

Mathematics

9th

Triangles

If ∆ ABC ≅ ∆ PQR and ∆ ABC is not congruent to ∆ RPQ, then which of the following is not true:
(A) BC = PQ (B) AC = PR (C) QR = BC (D) AB = PQ

05/11/2024

Mathematics

9th

Lines & Angles

Prove that a triangle must have atleast two acute angles.

05/11/2024

Mathematics

9th

Lines & Angles

Prove that two lines that are respectively perpendicular to two intersecting lines intersect each other.
[Hint: Use proof by contradiction].

05/11/2024

Mathematics

9th

Lines & Angles

Prove that through a given point, we can draw only one perpendicular to a given line.
[Hint: Use proof by contradiction]

05/11/2024

Mathematics

9th

Lines & Angles

A transversal intersects two parallel lines. Prove that the bisectors of any pair of corresponding angles so formed are parallel.

05/11/2024

Mathematics

9th

Lines & Angles

If two lines intersect, prove that the vertically opposite angles are equal.

05/11/2024

Mathematics

9th

Lines & Angles

Prove that the sum of the three angles of a triangle is 180°.

05/11/2024

Mathematics

9th