Math Is Fun Forum

owenflo

Member

Registered: 2014-07-21

Posts: 115

PLEASE HELP triangles

4. What is the minimum number of right angles there can be?

A8
B10
C3
D0
E 12
F 7

12. Each set of numbers below represents the measures of three angles.
Which set represent angle measures that could be found in a triangle?

A(30o, 100o, 20o)
B(36o, 42o, 65o)
C(30o, 57o, 30o)
D(44o, 63o, 73o)
E (67o, 41o, 62o)
F (29o, 131o, 40o)

19. Here are two triangles. I am trying to measure the area of triangle ABC. The formula for area of a triangle is

base*height/2.

I know the base, but I need to find the height. I know the top of triangle ABC is directly above a point 4.5 units from point A. I also know that <CAB is the same as <FDE, and that ls_DF has a length of 1, and ls_FE has a length of 1.43. What is the area of triangle ABC?

A15.26 square units
B19.31 square units
C25.37 square units
D27.16 square units
E 27.19 square units
F 13.02 square units

owenflo

Member

Registered: 2014-07-21

Posts: 115

Re: PLEASE HELP triangles

For #4 I said A and it was incorrect.
For #12 I said C and it was incorrect.
For#19 I said F and it was incorrect.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,621

Re: PLEASE HELP triangles

hi owenflo,

Cannot help with Q4 because this requires a diagram.

Q12.  You said C.  30 + 57 + 30 is not 180. 

Q19.  Sorry.  I cannot sort this out either.  I'm assuming A is the vertex so I can place D below it so that AD = 4.5  Is that correct? .  And where is F?

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob