A triangle with angles of 20 and 35 degrees is classified as which of the following?
a)Equilateral
b)Isosceles
c)Acute
d)Obtuse
2007-08-21 08:11:28 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
d. obtuse because a triangle has a total of 180 degrees.
20 + 35 = 55
180 - 55 = 125
125 is the 3rd angle. because it is greater than 90. it is obtuse
2007-08-21 08:16:49 · answer #1 · answered by jayj 3 · 0⤊ 0⤋
d) Obtuse.
The angles of a triangle must add up to 180.
In an equilateral triangle, all 3 sides and therefore all 3 angles are equal (60°)
In an isosceles triangle has 2 equal side and 2 equal angles.
An acute triangle has all three angles less than 90 degrees.
An obtuse triangle has one angle greater than 90 degrees. This one has angles of 20, 35 and 125 (180-20-35).
2007-08-21 08:18:48 · answer #2 · answered by T 5 · 0⤊ 0⤋
d) obtuse
An obtuse triangle is any triangle with one angle measuring greater than 90 degrees. The last angle would be 125 (180-20-35), which is an obtuse angle.
2007-08-21 08:18:41 · answer #3 · answered by jaymee 2 · 0⤊ 0⤋
180 degreees in a triangle total
if 2 angles are 20 and 35...the remaining angle must be...
180-(20+35)
180-55
125
since 20 and 35 arer under 90 dgrees, they are acute angles. but since 135 is over 90 degrees, it is obtuse. there for, the only triangle with 2 acute angles and 1 abtuse angle is an obtuse triangle.
=] best answer??
2007-08-21 08:17:38 · answer #4 · answered by yeahxitsxsarah 2 · 0⤊ 1⤋
d)Obtuse
20+35=55
180-55=125 (125 is the measure of the third angle)
125>90 and is an obtuse angle sooo it's an obtuse triangle : )
2007-08-21 08:21:53 · answer #5 · answered by K C 2 · 0⤊ 0⤋
Obtuse. If you have two angles that measure 25 and 35, then the last one must measure 120. If theta>90 then there is an obtuse triangle.
2007-08-21 08:15:35 · answer #6 · answered by de4th 4 · 0⤊ 2⤋
Obtuse.... because the last angel to make it 180 degrees inside would be 120
2007-08-21 08:16:00 · answer #7 · answered by bigpaw55 3 · 0⤊ 2⤋
None of your answers: it is a SCALENE triangle. All the angles and all the sides have different sizes.
2007-08-21 08:19:05 · answer #8 · answered by lenpol7 7 · 0⤊ 0⤋
obtuse
2007-08-21 08:21:02 · answer #9 · answered by Snow 2 · 0⤊ 0⤋
take out a protractor to draw out the triangle and decide for yourself.....
2007-08-21 08:21:32 · answer #10 · answered by ilovemymercedes 3 · 0⤊ 0⤋