6.1 law of sines and area of oblique triangle

An oblique triangle is any triangle that _______.

• does not have a right angle

• has 1 right angle

• has 2 equal sides

• has 3 different sides

Use the angles to classify the triangles

all angles less than 90° - acute triangle

1 angle is equal to 90° - right triangle

1 angle is greater than 90° - obtuse triangle

Tags

CCSS.5.G.B.4

Use the angles to classify the triangles

all angles less than 90° - acute triangle

1 angle is equal to 90° - right triangle

1 angle is greater than 90° - obtuse triangle

• obtuse
• acute

• right

Tags

CCSS.HSG.CO.C.10

Use the angles to classify the triangles

all angles less than 90° - acute triangle

1 angle is equal to 90° - right triangle

1 angle is greater than 90° - obtuse triangle

Tags

CCSS.4.G.A.1

CCSS.4.G.A.2

Classify the triangle by both sides and angles (select all).

• Right triangle

• Acute triangle

• Obtuse triangle

• Isosceles triangle

• Scalene triangle

Tags

CCSS.5.G.B.3

CCSS.5.G.B.4

If a = 3, and b = 4, and C = 90°, can you use the equation
A = 1/2 ab sin(C) to find the area?

• Yes

• No

Answer explanation

A = 1/2 (3 · 4) sin(90) = 1/2 · 12 · 1 = 6

Same as 1/2 bh

Select all that match this type of triangle

• obtuse

• scalene

• oblique

• isosceles

Select all that match this type of triangle

• acute

• obtuse

• scalene

• oblique

An obtuse triangle will always have _____ obtuse angle(s).

• One

• Two

• Three

Tags

CCSS.HSG.CO.C.10

Classify the triangle by sides and angles (select all).

• Right triangle

• Acute triangle

• Oblique triangle

• Equilateral triangle

• Isosceles triangle

Tags

CCSS.HSG.CO.C.10

CCSS.HSG.SRT.D.11