5.8

Step-by-step explanation:

Let's use the area formula,

our base is 4.6cm, so b=4.6

our height is 2.5cm, so h=2.5

plug this in for our b and h

, multiply the 4.6 by the 2.5 and you get 11.5

a=1/2*11.5, multiply and we get

a= 5.75, rounding our answer to 1 decimal would give us,

a=5.8

10a: △ABC is an Equilateral triangle with all acute angles.

10b: △BCD is A scalene triangle with all acute angles.

10c: △BDE is An Isosceles triangle with one obtuse angle.

Step-by-step explanation:

10) Looking at the diagram at the bottom left;

- △ABC has 3 equal internal angles and as such, it means it will have 3 equal angles.

Thus, we can classify it as; Equilateral triangle with all acute angles.

- △BCD has 3 unequal angles. Thus, it's 3 sides are not equal. Also all the angles are less than 90°.

We can classify it as;

A scalene triangle with all acute angles

- △BDE has 2 equal angles and one angle greater than 90°. This means it has 2 equal sides.

Thus, we can classify it as;

- An Isosceles triangle with one obtuse angle.

omg

Step-by-step explanation: I finally found you can you pls help me whit my last question ♀️

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