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Cosine Rule: a2 = b2+c2-2bc*cos A is applicable to all triangles
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Is the Pythagorean theorem is true for all similar triangles?
Only right triangles.
How many triangles in star of David?
If it is in the form of two inverted triangles, then there are 8 triangles. If only the outline is used, there are 0 triangles.
Is all acute triangles similar?
Only if they have the same angles
How can you calculate the length of the hypotenuse of a right angle triangle?
By using the formula a2+b2=c2, where a is one side of the right-angled triangle and b is the other side of the right angle triangle. C stands for the hypotenuse of the right-angled triangle. Note: this formula only works for RIGHT-ANGLED TRIANGLES!!!
If six equilateral triangles are placed side by side so that only two sides of each triangle touch one of the other triangles what shape is formed?
Parellelogram
Can The law of cosines can only be applied to acute triangles?
No, it applies to all triangles.
Can law of cosines can only be applied to acute triangles?
No, it applies to all triangles.
When would you use the law of sines or law of cosines instead of a trigonometric ratio?
Trigonometric ratios, by themselves, can only be used for right angled triangles. The law of cosines or the sine law can be used for any triangle.
Can trigonometry be applied only in right angled triangles?
No. It can be used on any triangle.
What is the formula for the third side of a triangle?
a2+b2=c2, but that only works for right triangles, where c is opposite the right angle. The law of cosines, see Related Link below, will help for non right triangles, but you need to know one of the angles.
Is it true that Pythagorean theorem can only be used for right-angled triangles?
Yes. The Pythagorean Theorem is true for only right triangles. However, a variety of other similar equations can be used for other triangle types. Law of Sines: a/sinA = b/sinB = c/sinC Law of Cosines: c2 = a2 + b2 - 2ab*cosC
Does pythagoras' theorem work for all triangles?
no only right triangles
Does the Pythagoream Theorem Work on all triangles?
No, only right triangles
Does Pythagorean Theorem apply to triangles?
Yes. But only right triangles.
Is The HL Congruence Postulate of Triangles only for right triangles?
yes
Do all triangles have right angles?
No. Only right triangles do, and not all triangles can be right triangles. Equilateral triangles, for example, are always 60°-60°-60°. Isosceles and scalene triangles can be right triangles; all isosceles triangles have the additional useful property of being able to be split into two right triangles.
Is the Pythagorean theorem is true for all similar triangles?
Only right triangles.
