Math homework about trigonometry - sine rule.
on a map whose scale is 8 cm to 1 km, an estate is shown as a quadrilateral abcd. the length of the diagonal ac is 7 cm, bâc = 55°, bĉa = 77°, dâc = 90° and dĉa = 40°. (draw the figure)
calculate:
a) the length, in cm, of the side ab on the map;
b) the length, in km, which represented by ad;
c) the area, in km², which represented by δadc.

step-by-step explanation:

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we can't see all full 4 options, but if this is the full option, than the very left one is correct:

-2/5 * -3 3/4

remake the question, adding a picture of all the question, or write down the full left and right answers.

if e is the midpoint of bd, then bd is 14.

step-by-step explanation:

the area of a triangle is determined by the formula: base x height * 1/2

you'll need to assign a base to the triangle. based on the vertices given, the simplest base would be the line segment from (-2,1) to (2,1). the distance between any two numbers is found by just subtracting them. here, you should subtract the x values to find the distance of this side.

2 - (-2) = 4.

so the distance (aka the length of the base) is 4. the height of the triangle is the distance between the base and the highest point on the triangle which is (3,4). we should subtract the y values this time to find the height/distance.

4 - 1 = 3

so the height is 3.

base = 4

height = 3

hope this if needed hmu