## Can Law of Cosines be used for oblique triangles?

The Law of Cosines is used to find the remaining parts of an oblique (non-right) triangle when either the lengths of two sides and the measure of the included angle is known (SAS) or the lengths of the three sides (SSS) are known.

## How can you use sine and cosines to solve oblique triangles?

Like the law of cosines, you can use the law of sines in two ways. First, if you know two angles and the side opposite one of them, then you can determine the side opposite the other one of them. For instance, if angle A = 30°, angle B = 45°, and side a = 16, then the law of sines says (sin 30°)/16 = (sin 45°)/b.

**What is the formula for the given oblique triangle using the law of sine?**

Simply, it states that the ratio of the length of a side of a triangle to the sine of the angle opposite that side is the same for all sides and angles in a given triangle. In ΔABC is an oblique triangle with sides a,b and c , then asinA=bsinB=csinC .

### What cases where we can use the Law of Cosines in solving oblique triangles?

This law is used primarily in two situations: when two sides and their included angle are given, and when three sides are given. If two sides and their included angle are given, the next thing to calculate is the third side.

### What are the two types of oblique triangle?

Oblique triangles are broken into two types: acute triangles and obtuse triangles.

**Which of the following cases where we can use the Law of Cosines in solving oblique triangles?**

This law is used primarily in two situations: when two sides and their included angle are given, and when three sides are given. If two sides and their included angle are given, the next thing to calculate is the third side. The Law of Cosines, as shown above, is perfect for the situation.

#### In which case is the law of cosines required to solve the oblique triangle?

#### What is the importance of solving oblique triangle?

Any kind of triangle that is not a right triangle is an oblique triangle. Looking at the formula, we can see that it can help us to find the measurement of side c if we know the measurement of the other two sides, a and b, along with the angle opposite side c.

**What is SAS formula?**

Consider a,b, and c are the different sides of a triangle. Thus, the area of a SAS triangle formula is expressed as, When sides ‘b’ and ‘c’ and included angle A is known, the area of the triangle is: 1/2 × bc × sin(A) When sides ‘b’ and ‘a’ and included angle B is known, the area of the triangle is: 1/2 × ab × sin(C)

## How do you solve an oblique triangle?

To solve oblique triangles, use the laws of sine and cosine. There are four different potential scenarios: Solve the oblique triangle with the following data: a = 6 m, B = 45° and C = 105°. Solve the oblique triangle with the following data: a = 10 m, b = 7 m and C = 30°.

## What are the rules of a triangle?

Various Rules of Triangles. AA Rules: If two of the angles of one triangle is equal to the two angles of another triangle, and then the triangle is said to be similar. RAR Rules: If the angle of one triangle is the same as the angle of another triangle and the sides containing these angles are in the same ratio, then the triangles are similar.

**How do you solve triangles?**

To solve an SAS triangle use The Law of Cosines to calculate the unknown side, then use The Law of Sines to find the smaller of the other two angles, and then use the three angles add to 180° to find the last angle.

### How do you calculate the length of a triangle?

Formula for Length of Triangle. Triangle contains three face and three vertices. Sum of interior angle of the all type of triangle is 180 degree. The following diagram is declaring the length of the triangle. Length formula for triangle. The length formula for triangle is L = 2a / b. a is area of the triangle.